JPH10155196A - Speaker equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speaker equipment in which an undesired induction current is received and a lead wire is led out easily externally. SOLUTION: The speaker equipment 1 is provided with a primary coil 5 that is fixed to an outer circumferential plate 3 and receives a voice signal, a secondary coil 12 that is placed at the inner circumferential side via a magnetic gap 9 so as to be opposed to the primary coil 5 and is fitted to a bobbin 11, a diaphragm 13 fitted to the bobbin 11 and a magnetic circuit whose magnetic gap 9 holds the primary coil 5, and a lead wire 7 from the primary coil 5 is placed to a notch 6 provided from the inner circumferential side to the outer circumferential side of the outer circumferential plate 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a speaker device.

[0002]

2. Description of the Related Art Conventionally, an internal magnet type speaker device and an external magnet type speaker device have been known as speaker devices.

As shown in FIGS. 5 and 6, an inner magnet type speaker device 100 has a magnet 101 and a yoke 102 formed so as to surround the magnet 101 and having a substantially concave shape as a whole. The yoke 102 is provided with a primary coil 104 to which an audio signal is supplied at the periphery of an opening 103 provided on the yoke 102. In the primary coil 104, a lead wire 106 is led out to the upper surface of the yoke 102 along the outer peripheral direction. On the other hand, the magnet 101 has a disc-shaped pole piece 1 on its upper surface.
05 is provided. The pole piece 105 constitutes a magnetic gap 107 by its end face and the end face forming the opening 103 of the yoke facing this end face.

The magnetic gap 107 has a bobbin 10
8 is provided on the outer peripheral surface of the bobbin 108.
One-turn secondary coil 109 facing the secondary coil 104
Is provided. A diaphragm 110 having a dome shape as a whole is attached to the bobbin 108. The diaphragm 110 has an edge portion 111 provided in a bay shape continuously from a side edge thereof, and an end portion thereof is fixed to the upper surface of the yoke 102.

[0005] The speaker device 100 thus configured
When current is supplied to the primary coil 104, the secondary coil 109 is induced and the diaphragm 110 is induced by Lorentz force.
Vibrates. And such a speaker device 100
According to this, since the primary coil 104 is directly wound around the yoke 102 formed of a metal material having excellent heat conduction characteristics, the primary coil 104 is hardly thermally damaged even when a large signal is input, and the bobbin Since the lead wire 106 from the lead wire 108 is unnecessary, the vibration of the bobbin 108 is well-balanced and distortion is eliminated, and furthermore, the lead wire 106 does not vibrate, so that the bobbin 108 is hardly mechanically damaged.

As shown in FIGS. 7 and 8, an external magnet type speaker device 120 has a ring-shaped magnet 121.
And a yoke 123 provided to close the central opening 122 on the bottom surface of the magnet 121. In addition, the magnet 121 has a ring-shaped outer peripheral plate 1 protruding slightly inward from the center opening 122 on the upper surface thereof.
24 are provided. On the other hand, a columnar pole piece 125 is provided upright on the yoke 123 so as to pass through the central opening 122 of the magnet 121. The pole piece 125 is provided at its upper end with a primary coil 126 to which an audio signal is supplied. The lead wire 129 of the primary coil 126 extends to the lower side of the yoke 123 along the outer peripheral surface of the pole piece 125, and is guided outward along the yoke 123. The outer peripheral surface of the upper end of the pole piece 125 is
A magnetic gap 128 is formed by the end face of the opening 127 provided in the outer peripheral plate 124.

In the magnetic gap 128, the bobbin 13
0 is disposed on the outer peripheral surface of the bobbin 130.
One-turn secondary coil 131 facing primary coil 126
Is provided. The bobbin 130 is provided with an inner peripheral side of a diaphragm 132 formed so as to spread outward. An edge portion 133 is formed on the outer peripheral side of the diaphragm 132, and the edge portion 133 is fixed to a frame (not shown). Further, a cap 134 having a dome shape as a whole is attached to the diaphragm 132 so that dust does not enter the magnetic circuit into the central region.

[0008] The speaker device 120 thus configured
When current is supplied to the primary coil 126, the secondary coil 131 is induced and the diaphragm 132 is induced by Lorentz force.
Is vibrated. And such a speaker device 120
According to this, since the primary coil 126 is directly wound around the pole piece 125 formed of a metal material having excellent heat conduction characteristics, it is hardly thermally damaged even when a large signal is input, and Leader 129 from bobbin 130
Is unnecessary, the balance of the vibration of the bobbin 130 is well-balanced, and the lead wire 129 does not vibrate.

[0009]

However, the above-described inner-magnet type speaker device 100, as shown in FIG.
When an induced current flows through the secondary coil 109, the induced current also flows through the pole piece 105 formed of a metal material. Since the induced current flowing through the pole piece 105 does not contribute to the vibration of the diaphragm 110 at all, the efficiency is reduced.
Further, even in the case of the external magnet type speaker device 120,
As shown in FIG. 7, when an induced current flows through the secondary coil 131, the outer peripheral plate 1 made of a metal material is used.
The induced current also flows through the 24. The induced current flowing through the outer peripheral plate 124 is similarly applied to the diaphragm 13
Since it does not contribute to the second vibration at all, the efficiency is reduced. In other words, the induced current causes the secondary coil 10 that affects the vibration of the diaphragms 110 and 132 to change.
Ideally, it should flow only to 9, 131.

The external magnet type speaker device 120 has the following features.
The lead wire 129 of the next coil 126 is connected to the pole piece 125.
It had to be pulled out from the inside through the inside, and the assembling work was difficult.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a speaker device capable of preventing unnecessary induced current from flowing and facilitating extraction of a lead wire to the outside.

[0012]

In order to solve the above-mentioned problems, a speaker device according to the present invention is fixedly attached to an outer peripheral plate and receives an audio signal.
A secondary coil mounted on the bobbin on the inner peripheral side via a magnetic gap so as to face the primary coil, a diaphragm mounted on the bobbin, and a secondary coil positioned in the magnetic gap And a magnetic circuit for causing the magnetic circuit to operate.
The lead wire of the primary coil is disposed in a cutout provided from the inner peripheral side to the outer peripheral side of the outer peripheral plate.
Therefore, in the speaker device, the outer peripheral plate becomes an open end ring to prevent the induction current from flowing, and the installation work can be easily performed by arranging the lead wire in the cutout portion.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a speaker device according to the present invention will be described in detail with reference to the drawings. The speaker device 1 according to the first embodiment is obtained by applying the present invention to an inner-magnet type speaker device.

As shown in FIGS. 1 and 2, for example, the speaker device 1 includes a magnet 1 and a yoke 3 having a substantially concave shape formed as a whole so as to surround the magnet 2 constituting an outer peripheral plate. Have. This yoke 3
Is provided with a primary coil 5 to which an audio signal is supplied at the periphery of the opening 4 provided on the upper side. The yoke 3 has a notch 6 penetrating vertically from the inner peripheral side to the outer peripheral side. The notch 6 has a width of about 1 mm. A lead wire 7 for the primary coil 5 is provided in the notch 6 and is led out of the speaker device 1. Therefore, the speaker device 1 can be easily assembled because the lead wire 7 can be provided in the cutout 6. The lead wire 7 is bonded and fixed to the cutout 6 with an adhesive having excellent heat conduction characteristics.

A pole piece 8 made of a disc-shaped metal material is adhered and fixed to the upper surface of the magnet 2. The pole piece 8 forms a magnetic gap 9 with its outer peripheral end surface and an end surface that constitutes the opening 4 of the yoke 3 facing the outer peripheral end surface.

A cylindrical bobbin 11 is provided in the magnetic gap 9. The bobbin 108 is provided with a one-turn secondary coil 12 facing the primary coil 5 on its outer peripheral surface. And, in this bobbin 11,
A diaphragm 13 having a dome shape as a whole is attached. The diaphragm 13 has an edge portion 111 provided in a bay shape continuously from a side edge thereof, and an end portion thereof is adhesively fixed to the upper surface of the yoke 3.

The loudspeaker device 1 thus configured is
When a current is supplied to the primary coil 5, an induced current flows through the secondary coil 12, and the diaphragm 13 is vibrated by Lorentz force. In such a speaker device 1, since the primary coil 5 is directly wound around the yoke 3 formed of a metal material having excellent heat conduction characteristics, it is thermally damaged even when a large signal is input. And it is not necessary to draw out the lead wire 7 from the bobbin 11.
The balance of vibration of 1 is good and distortion is gone.
Since the lead wire 7 does not vibrate, it can be hardly damaged mechanically.

The speaker device 1 has the notch 6 formed on the yoke 3 from the inner peripheral side to the outer peripheral side as described above. Therefore, the speaker device 1 has the secondary coil 1
When an induced current flows through the pole piece 2, the induced current is prevented from flowing through the pole piece 8 formed of a metal material. That is, the notch 6 is formed in the upper surface of the yoke 3 so that the yoke 3 functions as an open-end ring so that no induced current flows.

As described above, the speaker device 1 has the notch 6 formed on the upper surface of the yoke 3 constituting the outer peripheral plate, so that the operation of pulling out the lead wire 7 to the outside of the speaker device 1 is facilitated. An electric current is prevented from flowing through the pole piece 8 which is unnecessary for the vibration of the diaphragm 13, and the speaker characteristics can be improved.

Although the case where the notch 6 is formed so as to penetrate the upper surface of the yoke 3 has been described above, the notch 6 does not necessarily need to be penetrated. It is also possible to make the current difficult to flow.

Next, regarding the second speaker device 20,
This will be described in detail with reference to FIGS. The speaker device 20 is one in which the present invention is applied to the external magnet type speaker device 1.

The speaker device 20 has a ring-shaped magnet 21 and a yoke 23 provided so as to close the central opening 22 on the bottom surface of the magnet 21. Further, a ring-shaped outer peripheral plate 24 made of a metal material is provided on the upper surface of the magnet 21 so as to protrude slightly inside the central opening 22. The outer peripheral plate 24 is provided with a primary coil 25 on the inner peripheral side end face. In addition, the outer peripheral plate 24 is provided with a notch 26 provided from the inner peripheral side to the outer peripheral side. The notch 26 has a width of 1 mm and is formed to penetrate in the vertical direction, and the lead wire 27 of the primary coil 25 is provided. Therefore, the speaker device 20 can be easily assembled because the lead wire 27 can be provided in the notch 26. Note that this lead wire 27
Is bonded and fixed to the notch 26 with an adhesive having excellent heat conduction characteristics.

The columnar pole piece 2 is inserted into the yoke 23 so that the central opening 22 of the magnet 21 is inserted therethrough.
8 are erected. The outer peripheral surface of the upper end of the pole piece 28 is provided with an opening 29 provided in the outer peripheral plate 24.
And the end surface of the magnetic gap 31.

A bobbin 32 is provided in the magnetic gap 31, and a one-turn secondary coil 33 is provided on the outer peripheral surface of the bobbin 32 so as to face the primary coil 25. The bobbin 130 is bonded and fixed to the inner peripheral side of the diaphragm 34 formed so as to spread outward. An edge 35 is formed on the outer peripheral side of the diaphragm 34. The edge portion 35 is fixed to a frame (not shown). Further, a cap 36 having a dome shape as a whole is disposed in the diaphragm 34 so that dust does not enter the magnetic circuit in the central area.

The speaker device 20 thus configured
When current is supplied to the primary coil 25, the secondary coil 33 is induced and the diaphragm 34 is vibrated by Lorentz force. Then, the speaker device 20 includes the primary coil 12
6 is directly wound around the outer peripheral plate 24 formed of a metal material having excellent heat conduction characteristics, so that it is hardly thermally damaged even when a large signal is input.
The bobbin 32 is unnecessary because the lead wire 27 from
And the distortion is eliminated, and furthermore, since the lead wire 27 does not vibrate, it is hard to be mechanically damaged.

Further, as described above, the notch 6 is formed in the outer peripheral plate 24 from the inner peripheral side to the outer peripheral side.
Are formed. Therefore, in the speaker device 1, the induced current is prevented from flowing through the outer peripheral plate 24.
That is, the outer peripheral plate 24 has a notch 26 on its upper surface.
Is formed so as to function as an open-end ring so that no induced current flows. Further, the speaker device 20 differs from the speaker device 120 shown in FIGS. 7 and 8 described above in that the primary coil 25 is connected to the outer peripheral plate 2.
4, the lead wire 27 is easily drawn in the outer peripheral direction.

As described above, the speaker device 20 is provided with the primary coil 25 in the opening 29 of the outer peripheral plate 24 and the cutout 26 formed on the upper surface thereof, so that the lead wire 27 can be pulled out of the speaker device 20. And the induced current is prevented from flowing through the outer peripheral plate 24, which is not necessary for the vibration of the diaphragm 13, so that the speaker characteristics can be improved.

The case where the notch 26 is formed so as to penetrate the upper surface of the outer peripheral plate 24 has been described above. However, the notch 26 does not necessarily need to be penetrated, and may be formed as a concave groove, for example. In addition, it is possible to make the induced current hard to flow.

[0029]

According to the speaker device of the present invention, 1
Since the lead wire of the next coil is disposed in the cutout provided from the inner peripheral side to the outer peripheral side of the outer peripheral plate, the outer peripheral plate becomes a terminal opening ring, and the induced current is prevented from flowing, and By arranging the lead wire in the notch, the mounting operation can be easily performed. Further, in the speaker device according to the present invention, since the primary coil is provided on the outer peripheral plate, it is easy to draw the lead wire of the primary coil.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an internal magnet type speaker device according to a first embodiment.

FIG. 2 is a plan view of the speaker device.

FIG. 3 is a longitudinal sectional view of an external magnet type speaker device according to a second embodiment.

FIG. 4 is a plan view of the speaker device.

FIG. 5 is a longitudinal sectional view of a conventional inner magnet type speaker device.

FIG. 6 is a plan view of the speaker device.

FIG. 7 is a longitudinal sectional view of a conventional external magnet type speaker device.

FIG. 8 is a plan view of the speaker device.

[Explanation of symbols]

Reference Signs List 1 internal magnet type speaker device, 2 magnet, 3 yoke, 4 opening, 5 primary coil, 6 cutout, 7 lead wire, 8 pole piece, 9 magnetic gap, 11
Bobbin, 12 secondary coil, 13 diaphragm

Claims (1)

[Claims] 1. A primary coil fixedly attached to an outer peripheral plate and to which an audio signal is inputted, and attached to a bobbin at an inner peripheral side via a magnetic gap so as to face the primary coil. A secondary coil, a diaphragm attached to the bobbin, and a magnetic circuit for positioning the secondary coil in the magnetic gap, wherein the lead wire of the primary coil extends from the inner peripheral side to the outer peripheral side of the outer peripheral plate. A speaker device, wherein the speaker device is provided in a notch provided over the side.